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问题 选择题

下列做圆周运动的物体，由物体所受重力和支持力的合力提供向心力的是（　　）

A．火车以规定的速率转弯

B．自行车在水平路面上转弯

C．汽车在水平公路上转弯

D．人造地球卫星绕地球做匀速圆周运动

答案

A、火车以规定的速率转弯靠重力和支持力的合力提供向心力．故A正确．

B、自行车在水平路面上转弯，靠静摩擦力提供向心力．故B错误．

C、汽车在水平公路上转弯，靠静摩擦力提供向心力．故C错误．

D、人造地球卫星绕地球做匀速圆周运动靠万有引力提供向心力．故D错误．

故选A．

解答题

一篇表扬稿共920个字，小明要把它抄写在宣传栏里．每行写117个字，8行能写完吗？
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单项选择题

Starting with his review of Skinner’s Verbal Behavior, Noam Chomsky had led the psycholinguists who argue that man has developed an innate (天生的) capacity for dealing with the linguistic universals common to all languages. Experience and learning then provide only information about the (1) instances of those universal aspects of language which are needed to communicate with other people within a particular language (2) .

This linguistic approach (3) the view that language is built upon learned associations between words. What is learned is not strings of words per se (本身), but (4) rules that enable a speaker to (5) an infinite variety of novel sentences. (6) single words are learned as concepts: they do not stand in a one-to-one (7) with the particular thing signified, but (8) all members of a general class.

This view of the innate aspect of language learning is at first not readily (9) into existing psychological frameworks and (10) a challenge that has stimulated much thought and new research directions. Chomsky argues that a precondition for language development is the existence of certain principles "intrinsic (原有的) to the mind" that provide invariant structures (11) perceiving, learning and thinking. Language (12) all of these processes; thus its study (13) our theories of knowledge in general.

Basic to this model of language is the notion that a child’s learning of language is a kind of theory (14) . It’s thought to be accomplished (15) explicit instruction, (16) of intelligence level, at an early age when he is not capable of other complex (17) or motor achievements, and with relatively little reliable data to go on. (18) , the child constructs a theory of an ideal language which has broad (19) power. Chomsky argues that all children could not develop the same basic theory (20) it not for the innate existence of properties of mental organization which limit the possible properties of languages.

19（）

A.instinctive

B.addictive

C.tentative

D.predictive
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